> The sort of uploading that interests me, would be to keep my body> but use nanotech to improve and augment.> > Could each neuron be rebuilt to run faster ?

Yes, although interfacing them to your body may be a bit complicated
since your muscles would not become faster, so you could think movements
faster than you can actually do them; even upgrading the muscles would
probably not help, since they will still move more slowly than your
thoughts.